Dell Force10 S4820T FTOS Command Reference Guide - Page 1047
Enabling Portfast BPDU guard and loop guard at the same time on a port results in
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Command Modes Command History Usage Information loopguard rootguard (C-, S-, and E-Series TeraScale only) Enter the keyword loopguard to enable STP loop guard on an MSTP port or port-channel interface. (C-, S-, and E-Series TeraScale only) Enter the keyword rootguard to enable root guard on an MSTP port or port-channel interface. INTERFACE Version 8.3.19.0 Version 8.4.2.1 Version 8.3.7.0 Version 8.2.1.0 Version 7.6.1.0 Version 7.5.1.0 Version 6.1.1.0 Introduced on S4820T Introduced the loopguard and rootguard options on the E-Series TeraScale, C-Series, and S-Series. Introduced on S4810 Introduced hardware shutdown-on-violation option Added support for S-Series Added support for C-Series Support for BPDU guard added On an MSTP switch, a port configured as an edge port will immediately transition to the forwarding state. Only ports connected to end-hosts should be configured as an edge port. Consider an edge port similar to a port with spanning-tree portfast enabled. If shutdown-on-violation is not enabled, BPDUs will still be sent to the RPM CPU. Root guard and loop guard cannot be enabled at the same time on a port. For example, if you configure loop guard on a port on which root guard is already configured, the following error message is displayed: % Error: RootGuard is configured. Cannot configure LoopGuard. When used in an MSTP network, if root guard blocks a boundary port in the CIST, the port is also blocked in all other MST instances. Enabling Portfast BPDU guard and loop guard at the same time on a port results in a port that remains in a blocking state and prevents traffic from flowing through it. For example, when Portfast BPDU guard and loop guard are both configured: • If a BPDU is received from a remote device, BPDU guard places the port in an err-disabled blocking state and no traffic is forwarded on the port. • If no BPDU is received from a remote device, loop guard places the port in a loop-inconsistent blocking state and no traffic is forwarded on the port. Multiple Spanning Tree Protocol (MSTP) | 1047